Feature: 1. Weight Reduction: Battery backpack can reduce the workload of workers, equal to carrying a backpack of about 4KG, which can be stuck with four fully charged batteries can work for a long time. External 1.2M extension cable interface can be inserted. 2. Ergonomic Safety Belt: This portable backpack power supply can be adjusted ergonomic safety belt to improve operator comfort and make the work process easy. 3. Power Indicator: The integrated LED battery level indicator allows the operator to monitor the battery level of each of the four batteries individually, which means this battery backpack is very convenient and fast. 4. Design with Base: Durable and bright, this backpack power supply with base makes the backpack power supply upright during staff breaks, with integrated carrying handle for enhanced work efficiency. 5. Cordless Tools: The power system is a cordless tool system powered by 18V lithium ion batteries. 18V lithium ion batteries have the fastest charging time in their class, so they spend more time working and less time sitting on the charger. Specification: Item Type: Portable Backpack Power Applicable Battery: 18V Lithium Battery Material: ABS Tips to Maintain the Longest Battery Life: 1. Charge the battery pack before completely discharging it. When you find that your tool is low on power, be sure to stop tool operation and recharge the battery pack. 2. Never charge a fully charged battery pack. Overcharging will shorten the life of the battery. 3. Charge the battery pack at room temperature of 10℃-40℃ (50℉-104℉). Allow the hot battery pack to cool before charging. 4. Remove the battery pack from the tool or charger when it is not in use. 5. If you do not use the battery for a long period of time (more than 6 months), charge the battery.. Package List: 1 x Portable Backpack Power Supply1 x Power Cable Note: 1. Compatible with 18V lithium ion batteries with an asterisk.2. Only genuine batteries and chargers are used.